{
  "cveId": "CVE-2026-98723",
  "url": "https://patchblox.com/security/cve/CVE-2026-98723",
  "summary": "CVE-2026-98723 is fixed in linux on 1 platform by DEBIAN-CVE-2026-98723 (version 7.2.10-1), released October 19, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "nvmet: copy the hostid into the ctrl before creating PR pc_refs",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  nvmet: copy the hostid into the ctrl before creating PR pc_refs  Commit 6202783184bf (\u0022nvmet: Improve nvmet_alloc_ctrl() interface and implementation\u0022) added a second uuid_copy() of args-\u003Ehostid near the end of nvmet_alloc_ctrl(), and commit 7b658153f1b8 (\u0022nvmet: Remove duplicate uuid_copy\u0022) removed the original copy that sat before nvmet_ctrl_init_pr() instead of the new one.  Since then nvmet_ctrl_init_pr() snapshots ctrl-\u003Ehostid into the per-controller per-namespace reservation refs while the uuid_copy() from the connect data runs later, after the controller is published. The ctrl is allocated with kzalloc(), so every pc_ref created on this path stores the nil UUID.  pc_ref-\u003Ehostid has a single consumer: nvmet_pr_set_ctrl_to_abort() matches it against the preempted registrant\u0027s hostid to kill and drain the victim\u0027s in-flight I/O for Preempt and Abort.  The match can never hit with the nil UUID, so whenever a namespace with reservations enabled exists before a host connects, which includes every reconnect, Preempt and Abort silently degrades into a plain Preempt: the preempting host sees success while the victim\u0027s in-flight I/O is still in the air.  Copy the hostid where the rest of the connect data is consumed, before the controller is published and before nvmet_ctrl_init_pr() takes its snapshot.",
  "published": "2026-10-18T16:17:25Z",
  "severity": "",
  "epss": 0.00198,
  "epssPercentile": 0.09631,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-98723",
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.2.10-1",
      "fix": "DEBIAN-CVE-2026-98723",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-98723",
      "released": "2026-10-19T16:27:52Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T13:06:02Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}